gistfile1.py

import timeit
from cStringIO import StringIO

x1 = xrange(1000)
x2 = xrange(10000)

smallbuf = "buffer"
bigbuf = "buffer" * 1024

def str_join1000(buf):
    lst = []
    for i in x1:
        lst.append(buf)
    return ''.join(lst)

def string_io1000(buf):
    io = StringIO()
    write = io.write
    for i in x1:
        write(buf)
    return io.getvalue()

def map1000(buf):
    lst = map(lambda x:buf, x1)
    return ''.join(lst)

def str_join10000(buf):
    lst = []
    for i in x2:
        lst.append(buf)
    return ''.join(lst)

def string_io10000(buf):
    io = StringIO()
    write = io.write
    for i in x2:
        write(buf)
    return io.getvalue()

def map10000(buf):
    lst = map(lambda x:buf, x2)
    return ''.join(lst)

res = timeit.timeit("str_join1000(buf)", "from __main__ import str_join1000, smallbuf as buf", number=1000)
print "small string_join x 1000: %f" % res

res = timeit.timeit("string_io1000(buf)", "from __main__ import string_io1000, smallbuf as buf", number=1000)
print "small string_io x 1000: %f" % res

res = timeit.timeit("map1000(buf)", "from __main__ import map1000, smallbuf as buf", number=1000)
print "small map x 1000: %f" % res

res = timeit.timeit("str_join10000(buf)", "from __main__ import str_join10000, smallbuf as buf", number=1000)
print "small string_join x 10000: %f" % res

res = timeit.timeit("string_io10000(buf)", "from __main__ import string_io10000, smallbuf as buf", number=1000)
print "small string_io x 10000: %f" % res

res = timeit.timeit("map10000(buf)", "from __main__ import map10000, smallbuf as buf", number=1000)
print "small map x 10000: %f" % res

res = timeit.timeit("str_join1000(buf)", "from __main__ import str_join1000, bigbuf as buf", number=1000)
print "big string_join x 1000: %f" % res

res = timeit.timeit("string_io1000(buf)", "from __main__ import string_io1000, bigbuf as buf", number=1000)
print "big string_io x 1000: %f" % res

res = timeit.timeit("map1000(buf)", "from __main__ import map1000, bigbuf as buf", number=1000)
print "big map x 1000: %f" % res

res = timeit.timeit("str_join10000(buf)", "from __main__ import str_join10000, bigbuf as buf", number=1000)
print "big string_join x 10000: %f" % res

res = timeit.timeit("string_io10000(buf)", "from __main__ import string_io10000, bigbuf as buf", number=1000)
print "big string_io x 10000: %f" % res

res = timeit.timeit("map10000(buf)", "from __main__ import map10000, bigbuf as buf", number=1000)
print "big map x 10000: %f" % res